<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入评论内容（最多120字）" maxlength="120" v-model="msg"></textarea>
        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>
        <div class="cmt-list">
            <div class="cmt-item" v-for="(item, i) in list" :key="item.add_time">
                <div class="cmt-title">
                    第{{ i+1 }}楼&nbsp;&nbsp;&nbsp;用户：{{ item.user_name }}&nbsp;&nbsp;&nbsp;&nbsp;发表时间：{{ item.add_time | dateFormat }}
                </div>
                <div class="cmt-body">
                    {{ item.content === 'undefined' ? '此用户很懒，什么都没说': item.content }}
                </div>
            </div>
        </div>
        <!-- <div class="cmt-list">
            <div class="cmt-item" v-for="(item, i) in comments" :key="item.add_time">
                <div class="cmt-title">
                    第{{ i+1 }}楼&nbsp;&nbsp;用户：{{ item.user_name }}&nbsp;&nbsp;发表时间：{{ item.add_time | dateFormat }}
                </div>
                <div class="cmt-body">
                    {{ item.content === 'undefined' ? '此用户很懒，什么都没说': item.content }}
                </div>
            </div>
        </div> -->
        <!-- <mt-button type="danger" size="large" icon="more" plain @click="getMore">加载更多</mt-button> -->
        <mt-button type="danger" size="large" icon="more" plain>加载更多</mt-button>
    </div>
</template>

<script>
import { Toast } from "mint-ui"

export default {
    data(){
        return {
            pageIndex: 1, //默认展示第一页数据
            list: [  //本地评论数据
                { user_name: "匿名用户", add_time: "2019-10-08 12:12:12", content: "清纯"},
                { user_name: "匿名用户", add_time: "2019-10-08 12:12:11", content: "undefined"},
                { user_name: "匿名用户", add_time: "2019-10-08 12:12:10", content: "思恋"}
            ],  
            comments: [], //服务器评论数据
            msg: ""  //评论输入内容
        };
    },
    created(){
        this.getComments();
    },
    methods: {
        getComments() {  //从本地localStorage中加载评论列表
            var list = JSON.parse(localStorage.getItem("cmts") || "[]");
            this.list = list.concat(this.list);
        },
        // getComments(){  //从服务器获取评论
        //     this.$http.get("api/getcomments/" + this.id + "?pageindex=" + this.pageIndex).then(result => {
        //         if(result.body.status === 0){
        //             // this.comments = result.body.message;
        //             //用上一页的数据拼接上下一页的数据
        //             this.comments = this.comments.concat(result.body.message);
        //         }
        //         else{
        //             Toast("获取评论失败！");
        //         }
        //     })
        // },     
        getMore(){  //加载更多
            this.pageIndex++;
            this.getComments();
        },
        postComment(){  //发表评论保存到本地localStorage
            //校验内容是否为空
            if(this.msg.trim().length === 0){
                return Toast("评论内容不能为空！");
            }
            //拼接评论对象
            var cmt = { 
                user_name: '匿名用户',
                add_time: Date.now(),
                content: this.msg.trim()
            };
            //从localStorage中获取所有的评论
            var listcmt = JSON.parse(localStorage.getItem("cmts") || "[]");
            listcmt.unshift(cmt);
            //重新保存最新的评论数据
            localStorage.setItem("cmts", JSON.stringify(listcmt));
            //追加显示
            this.list.unshift(cmt);
            this.msg ="";
        }
        // postComment(){  //发表评论到服务器
        //     //校验内容是否为空
        //     if(this.msg.trim().length === 0){
        //         return Toast("评论内容不能为空！");
        //     }
        //     //参数1：请求的URL地址；参数2：提交给服务器的数据对象；参数3：定义提交时表单中数据格式
        //     this.$http.post('api/postcomment/' + this.$route.params.id, { content:this.msg.trim() }).then(function(result){
        //         if(result.body.status === 0){
        //             //拼接评论对象
        //             var cmt = { 
        //                 user_name: '匿名用户',
        //                 add_time: Date.now(),
        //                 content: this.msg.trim()
        //             };
        //             this.comments.unshift(cmt);
        //             this.msg = "";
        //         }
        //     });
        // }
    },
    props: ["id"]
}
</script>

<style lang="scss" scoped>
.cmt-container{
    h3{
        font-size: 18px;
    }
    textarea{
        font-size: 14px;
        height: 85px;
        margin: 0;
    }
    .cmt-list{
        margin: 5px 0;
        .cmt-item{
            font-size: 13px;
            line-height: 35px;
            .cmt-title{            
                background-color: #ccc;
            }
            .cmt-body{
                text-indent: 2em;
            }
        }
    }
}
</style>